By: keithmac - 28th April 2002 at 19:53
RE: DC-3
We’re into different English again. I believe this is what is known as a “Trembler Coil” on British built engines. On engines the spark is normally advanced about 20-30 degrees before top dead centre on the compression stroke to give the fuel time to burn and build up peak cylinder pressure just after TDC on the power stroke. These sparks are generated by the Magneto’s. On start up this is too far advanced, so an auxiliary coil sends a series of sparks to a trailing brush on the Magneto rotor arm which sends these to the spark plugs around 5 degs before TDC, which is just right for starting. Once the engines have started they are switched off. Hope that answers the question.
KeithMac
By: munnst - 25th April 2002 at 20:59
RE: DC-3
Maybe this is only on American aircraft?
Aircraft in question …
US Navy Douglas R4D-6 USN Bureau # 50819 served as an admiral’s VIP transport operated by Naval Air Transport Service at several stations during the 1940’s. Lovingly restored to this condition it can still be seen operated by the Mid Atlantic Air Museum of Reading, Pennsylvania at airshows all over the U.S.. www.maam.org
The switch in question is on the center overhead.
Three switches next to Starboard Engine Extinguisher Button.
Prime Start Vib
Left Left Left
On On On
* * *
On On On
Right Right Right
Vib (Vibrator Pump???)
Can post picture but don’t know how?
Ted.
By: PhantomII - 25th April 2002 at 20:48
RE: DC-3
I’m always interested in learning something, especially about the DC-3 series. Can you explain a bit more as to what this device is and maybe provide a photo is possible?
By: Kenneth - 25th April 2002 at 19:37
RE: DC3
Never heard of such a thing in an aero engine! Where did you hear
about this component? Do you by any chance mean the inertia starter?
Kenneth
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April 25, 2002 at 4:32 pm